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CVE-2026-33979

Express XSS Sanitizer is Express 4.x and 5.x middleware which sanitizes user input data (in req.body, req.query, req.headers and req.params) to prevent Cross Site Scripting (XSS) attack. A vulnerability has been identified in versions prior to 2.0.2 where restrictive sanitization configurations are silently ignored. In version 2.0.2, the validation logic has been updated to respect explicitly provided empty configurations. Now, if allowedTags or allowedAttributes are provided (even if empty), th
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:edec263efadcd4473081fe17c2e8170158567cd4b0de022d53c08878e218e3a7
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
1

Preserved source conflicts

No provider value was silently selected as the winner.

cwe · 2 assertions

{"cweId":"CWE-79","description":"CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:92bfbc9aaae31b8bbc211fa9fe2d43db4ab283a6d34c26374885f9af51b7f893 · sha256:61fc007b94a7e1fb… · /containers/cna/problemTypes/1/descriptions/0

{"cweId":"CWE-183","description":"CWE-183: Permissive List of Allowed Inputs","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:92bfbc9aaae31b8bbc211fa9fe2d43db4ab283a6d34c26374885f9af51b7f893 · sha256:61fc007b94a7e1fb… · /containers/cna/problemTypes/0/descriptions/0

Affected products and versions

1 source assertion
{"product":"express-xss-sanitizer","vendor":"AhmedAdelFahim","versions":[{"status":"affected","version":"< 2.0.2"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:92bfbc9aaae31b8bbc211fa9fe2d43db4ab283a6d34c26374885f9af51b7f893 · sha256:61fc007b94a7e1fb… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":8.2,"baseSeverity":"HIGH","confidentialityImpact":"LOW","integrityImpact":"HIGH","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:N","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:92bfbc9aaae31b8bbc211fa9fe2d43db4ab283a6d34c26374885f9af51b7f893 · sha256:61fc007b94a7e1fb… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

2 source assertions
{"cweId":"CWE-79","description":"CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:92bfbc9aaae31b8bbc211fa9fe2d43db4ab283a6d34c26374885f9af51b7f893 · sha256:61fc007b94a7e1fb… · /containers/cna/problemTypes/1/descriptions/0
{"cweId":"CWE-183","description":"CWE-183: Permissive List of Allowed Inputs","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:92bfbc9aaae31b8bbc211fa9fe2d43db4ab283a6d34c26374885f9af51b7f893 · sha256:61fc007b94a7e1fb… · /containers/cna/problemTypes/0/descriptions/0

Source references

3 source assertions
{"name":"https://github.com/AhmedAdelFahim/express-xss-sanitizer/commit/5623009ef11dcf095c163a38dea07b9cc22ad19f","tags":["x_refsource_MISC"],"url":"https://github.com/AhmedAdelFahim/express-xss-sanitizer/commit/5623009ef11dcf095c163a38dea07b9cc22ad19f"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:92bfbc9aaae31b8bbc211fa9fe2d43db4ab283a6d34c26374885f9af51b7f893 · sha256:61fc007b94a7e1fb… · /containers/cna/references/1
{"name":"https://github.com/AhmedAdelFahim/express-xss-sanitizer/releases/tag/v2.0.2","tags":["x_refsource_MISC"],"url":"https://github.com/AhmedAdelFahim/express-xss-sanitizer/releases/tag/v2.0.2"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:92bfbc9aaae31b8bbc211fa9fe2d43db4ab283a6d34c26374885f9af51b7f893 · sha256:61fc007b94a7e1fb… · /containers/cna/references/2
{"name":"https://github.com/AhmedAdelFahim/express-xss-sanitizer/security/advisories/GHSA-3843-rr4g-m8jq","tags":["x_refsource_CONFIRM"],"url":"https://github.com/AhmedAdelFahim/express-xss-sanitizer/security/advisories/GHSA-3843-rr4g-m8jq"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:92bfbc9aaae31b8bbc211fa9fe2d43db4ab283a6d34c26374885f9af51b7f893 · sha256:61fc007b94a7e1fb… · /containers/cna/references/0

Attribution and limitations

  • CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

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